On the various gambling forums I often see disgruntled sport betting or casino gamblers who've had their accounts frozen for various reasons. Usually it's just for the clients safety as there has been some suspicious activity on the account like multiple login attempts or logins from different countries. The amounts being held by bookmakers is usually just a few hundred dollars so for most gamblers it's not a life changing situation if they never get the money back. I saw this post on a forum today where a CloudBet customer claims that they are refusing to give him back 330 bitcoin, which at todays prices is over 1.25 million dollars. If the guy is legit then I feel really sorry for him but you have got to ask why anyone would keep that much bitcoin in a crypto sportsbook.